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C M Y CM MY CY CMY K
Hydrodynamic screwsEnergy extraction – efficient and fish-friendly
Ritz-Atro Pumpwerksbau GmbH
Max-Brod-Straße 2
90471 Nürnberg
Germany
Hydrodynamic screws Screw pumps Propeller pumps
Telefon + 49 (0) 911 998 12 - 0
Telefax + 49 (0) 911 813 76 46
eMail [email protected]
www.ritz-atro.de
ww
w.s
chle
ich-
burc
khar
dt.d
eIs
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date
: 0
3|2
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5
Ritz-Atro, founded in 1969, is now one of the most significant companies in
the area of effluent treatment and environmental protection – and indeed
throughout the world. Innovative drive and pioneering spirit characterised the
company from the very beginning.
Ritz-Atro sees itself as its customer's partner. Right from the phase of the
initial planning the customer is supported by well qualified staff, who guarantee
the secure and economic realisation of the construction project.
Ritz-Atro takes all conceivable measures to constantly further improve the
high standard of quality of its products. A quality management system certified
in accordance with DIN EN ISO 9001 is thus an important component part
of the company philosophy.
C M Y CM MY CY CMY K
Hydrodynamic screw
Power take-off unit
Trough
In the form of the Archimedean screw, the water extraction screw has been known since ancient
times. What is new is the patented application, which by an inversion of the energy flow in its
operation, turns the Archimedes’ screw trough pump into a power generator for the extraction
of energy.
A water power generating facility makes use of the energy difference between two different levels
of flowing water by transferring the water from natural bed of the stream at the higher level to
the bed at the lower level and effectively extracting its potential energy, which is then made
available at the rotor shaft for further use.
The advantages at a glance
Examples of useRitz-Atro’scompact solutionThe constructional effort required for a hydro-dynamic screw is small compared to thatrequired for a turbine. If the compact versionof a hydrodynamic screw (hydrodynamic screw+ trough + power take-off unit combined asa single unit) is used, the constructional effortcan be further reduced. The whole system isdelivered as an integrated whole. You savevaluable time, which you would otherwisespend during the careful matching up of theindividual construction components.We are happy to provide advice as to whichhydrodynamic screw is most sensible for you.Give us a call and agree upon a non-bindingon-site appointment!
The new type of energy generation
Watermotionin
Timecost optimisedand
Replacement for small turbine units whichrequire reconditioningReplacement for defective water-wheelsClean water outlet of sewage treatmentplantsResidual water screw for installation intoexisting channel or weirProduction of low-level hydrodynamic powerin former irrigation weirs
You can, of course, decide in favour of a con-ventionally designed hydrodynamic screw inthe aforementioned areas of application ratherthan a compact worm.
No control system – the screw matches itself automatically to the supply frequency andthe water supply
The efficiency is greater than with comparable waterwheels and small turbines
Flat, stable efficiency gradient
Robust, long wearing, trouble free
No cleaning, little maintenance
No fine screens necessary
Little underground digging required in comparison to turbines
Very friendly to fish
C M Y CM MY CY CMY K
Hydrodynamic screw
Power take-off unit
Trough
In the form of the Archimedean screw, the water extraction screw has been known since ancient
times. What is new is the patented application, which by an inversion of the energy flow in its
operation, turns the Archimedes’ screw trough pump into a power generator for the extraction
of energy.
A water power generating facility makes use of the energy difference between two different levels
of flowing water by transferring the water from natural bed of the stream at the higher level to
the bed at the lower level and effectively extracting its potential energy, which is then made
available at the rotor shaft for further use.
The advantages at a glance
Examples of useRitz-Atro’scompact solutionThe constructional effort required for a hydro-dynamic screw is small compared to thatrequired for a turbine. If the compact versionof a hydrodynamic screw (hydrodynamic screw+ trough + power take-off unit combined asa single unit) is used, the constructional effortcan be further reduced. The whole system isdelivered as an integrated whole. You savevaluable time, which you would otherwisespend during the careful matching up of theindividual construction components.We are happy to provide advice as to whichhydrodynamic screw is most sensible for you.Give us a call and agree upon a non-bindingon-site appointment!
The new type of energy generation
Watermotionin
Timecost optimisedand
Replacement for small turbine units whichrequire reconditioningReplacement for defective water-wheelsClean water outlet of sewage treatmentplantsResidual water screw for installation intoexisting channel or weirProduction of low-level hydrodynamic powerin former irrigation weirs
You can, of course, decide in favour of a con-ventionally designed hydrodynamic screw inthe aforementioned areas of application ratherthan a compact worm.
No control system – the screw matches itself automatically to the supply frequency andthe water supply
The efficiency is greater than with comparable waterwheels and small turbines
Flat, stable efficiency gradient
Robust, long wearing, trouble free
No cleaning, little maintenance
No fine screens necessary
Little underground digging required in comparison to turbines
Very friendly to fish
C M Y CM MY CY CMY K
Fossil fuels can be saved by means of theenvironmentally-friendly use of this source ofenergy. In this process the hydrodynamic screwcan be ideally inserted into the environment– without having a disruptive effect.
Varying water heads and varying water flowrates upstream and downstream of the screwonly marginally affect the efficiency and haveno effect on the function or operation of thehydrodynamic screw.With hydrodynamic screws, even minimumhydrodynamic potentials at powers from 1 kWcan be made use of economically.
With hydrodynamic screws, fine screeninginstallations for protecting against floatingobjects and fishes, needed for turbines, canbe done without: The parts washed up andfish can pass through the screw unhinderedand unharmed.
Energy losses due to a decrease in the heightof fall or flow losses are thus avoided.Due to the large jaw settings of the upstreamcoarse screens the rakings’ quantities that areincurred – and thus the waste disposal costs– are greatly reduced.
Small hydrodynamic facilities hide an immensepotential for extracting natural energy fromwater power.Another positive aspect is that the water becomesenriched with oxygen, which in turn improvesthe quality of the water downstream.
Ritz-Atro has commissioned a survey with anindependent expert in order to investigate thefish friendliness of its patented hydrodynamicworm. Here are some extracts:
Water banking and turbine installations arenot only a major obsticle and potential hazardfor fishes travelling upstream but also forfishes travelling downstream. Water powergeneration of any type is an obstacle for thespawning migration of migratory fishes. Inmany flowing waterways this affects the Euro-pean eel because eels are considerably affectedby Kaplan turbines and Francis turbines. Butgrey trout, salmon or river lamprey are also atrisk. […]
The length distribution for the various speciesshow that both small fishes (larger than 8 cm)and large specimens (up to 58 cm) can passthrough the hydrodynamic screw without harm.Even relatively small and weak fish such asgudgeon or the miller's thumb have been ableto pass through the hydrodynamic screw with-out injury. […]
The overall result is that the hydrodynamicscrew is very friendly to fishes and highlysuitable for fish migration. According to presentknowledge, the fishes suffer, if at all, onlyminor injury in form of damaged scales andbruising.
The advantages for fishFishery biological assessment (extract)
Why use a hydrodynamic screw?
C M Y CM MY CY CMY K
Fossil fuels can be saved by means of theenvironmentally-friendly use of this source ofenergy. In this process the hydrodynamic screwcan be ideally inserted into the environment– without having a disruptive effect.
Varying water heads and varying water flowrates upstream and downstream of the screwonly marginally affect the efficiency and haveno effect on the function or operation of thehydrodynamic screw.With hydrodynamic screws, even minimumhydrodynamic potentials at powers from 1 kWcan be made use of economically.
With hydrodynamic screws, fine screeninginstallations for protecting against floatingobjects and fishes, needed for turbines, canbe done without: The parts washed up andfish can pass through the screw unhinderedand unharmed.
Energy losses due to a decrease in the heightof fall or flow losses are thus avoided.Due to the large jaw settings of the upstreamcoarse screens the rakings’ quantities that areincurred – and thus the waste disposal costs– are greatly reduced.
Small hydrodynamic facilities hide an immensepotential for extracting natural energy fromwater power.Another positive aspect is that the water becomesenriched with oxygen, which in turn improvesthe quality of the water downstream.
Ritz-Atro has commissioned a survey with anindependent expert in order to investigate thefish friendliness of its patented hydrodynamicworm. Here are some extracts:
Water banking and turbine installations arenot only a major obsticle and potential hazardfor fishes travelling upstream but also forfishes travelling downstream. Water powergeneration of any type is an obstacle for thespawning migration of migratory fishes. Inmany flowing waterways this affects the Euro-pean eel because eels are considerably affectedby Kaplan turbines and Francis turbines. Butgrey trout, salmon or river lamprey are also atrisk. […]
The length distribution for the various speciesshow that both small fishes (larger than 8 cm)and large specimens (up to 58 cm) can passthrough the hydrodynamic screw without harm.Even relatively small and weak fish such asgudgeon or the miller's thumb have been ableto pass through the hydrodynamic screw with-out injury. […]
The overall result is that the hydrodynamicscrew is very friendly to fishes and highlysuitable for fish migration. According to presentknowledge, the fishes suffer, if at all, onlyminor injury in form of damaged scales andbruising.
The advantages for fishFishery biological assessment (extract)
Why use a hydrodynamic screw?
C M Y CM MY CY CMY K
Technical details
Efficiency of the hydrodynamic screwExpert report by the Kaiserslautern University of Applied Scienceto determine the efficieny
The efficiency of the hydrodynamic worm issimilar or higher than that of other small waterpower stations of this type (turbines, waterwheels).However the high partial load efficiency, whicheven still makes it possible to efficiently usethe hydraulic energy that is available even inthe event of a low inflow volume. This is onlypossible with great difficulty in plants of similarsizes.
By way of a summary the results of measurement carried out are as follows:
Worm efficiency under full load: 84,25%(near design point)Maximum absolute error: ± 4,21%Average absolute error: ± 1,98%
Worm efficiency under partial load: 79,13%(approx. 40% of the hydraulic design capacity)Maximum absolute error: ± 4,98%Average absolute error: ± 2,55%
These values are determined at our ”Mühlen in Taufers”plant and apply for the following sizes:Nominal water quantity 1420 l/sHeight of fall 2,11 mDiameter of the hydrodynamic screw 2 mNumber of revolutions 42,7 min-1
Water flow up to 5500 l/s
Head up to 10 m
Electric power provided to terminals(Generator Power)
300 kW200 kW150 kW100 kW
75 kW50 kW25 kW
10 kW
5 kW
3 kW
Water flow Q [m3/s]
Hea
d H
[m
]
0
1
2
3
4
5
6
7
8
9
10
11
0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
Efficiency up to 90%
Power up to 300 kW
Hydrodynamic screw
Overshot waterwheel
Kaplan water turbinedoubly regulated
Francis turbinenq = 37Francis turbinenq = 75
Quantity of water as a percentage
Effi
cien
cy a
s a
perc
enta
ge
5040 60 70100 20 30 80 90 1000
10
20
30
40
50
60
70
80
90
100
C M Y CM MY CY CMY K
Technical details
Efficiency of the hydrodynamic screwExpert report by the Kaiserslautern University of Applied Scienceto determine the efficieny
The efficiency of the hydrodynamic worm issimilar or higher than that of other small waterpower stations of this type (turbines, waterwheels).However the high partial load efficiency, whicheven still makes it possible to efficiently usethe hydraulic energy that is available even inthe event of a low inflow volume. This is onlypossible with great difficulty in plants of similarsizes.
By way of a summary the results of measurement carried out are as follows:
Worm efficiency under full load: 84,25%(near design point)Maximum absolute error: ± 4,21%Average absolute error: ± 1,98%
Worm efficiency under partial load: 79,13%(approx. 40% of the hydraulic design capacity)Maximum absolute error: ± 4,98%Average absolute error: ± 2,55%
These values are determined at our ”Mühlen in Taufers”plant and apply for the following sizes:Nominal water quantity 1420 l/sHeight of fall 2,11 mDiameter of the hydrodynamic screw 2 mNumber of revolutions 42,7 min-1
Water flow up to 5500 l/s
Head up to 10 m
Electric power provided to terminals(Generator Power)
300 kW200 kW150 kW100 kW
75 kW50 kW25 kW
10 kW
5 kW
3 kW
Water flow Q [m3/s]
Hea
d H
[m
]
0
1
2
3
4
5
6
7
8
9
10
11
0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
Efficiency up to 90%
Power up to 300 kW
Hydrodynamic screw
Overshot waterwheel
Kaplan water turbinedoubly regulated
Francis turbinenq = 37Francis turbinenq = 75
Quantity of water as a percentage
Effi
cien
cy a
s a
perc
enta
ge
5040 60 70100 20 30 80 90 1000
10
20
30
40
50
60
70
80
90
100
C M Y CM MY CY CMY K
Hydrodynamic screwsEnergy extraction – efficient and fish-friendly
Ritz-Atro Pumpwerksbau GmbH
Max-Brod-Straße 2
90471 Nürnberg
Germany
Hydrodynamic screws Screw pumps Propeller pumps
Telefon + 49 (0) 911 998 12 - 0
Telefax + 49 (0) 911 813 76 46
eMail [email protected]
www.ritz-atro.de
ww
w.s
chle
ich-
burc
khar
dt.d
eIs
sue
date
: 0
3|2
00
5
Ritz-Atro, founded in 1969, is now one of the most significant companies in
the area of effluent treatment and environmental protection – and indeed
throughout the world. Innovative drive and pioneering spirit characterised the
company from the very beginning.
Ritz-Atro sees itself as its customer's partner. Right from the phase of the
initial planning the customer is supported by well qualified staff, who guarantee
the secure and economic realisation of the construction project.
Ritz-Atro takes all conceivable measures to constantly further improve the
high standard of quality of its products. A quality management system certified
in accordance with DIN EN ISO 9001 is thus an important component part
of the company philosophy.
